Abstract：
:Levtiracetam (Lev), an inhibitor of SV2A (synaptic vesicle protein A2), affected the ATP-dependent priming of Ca(2+)-regulated exocytosis in antral mucous cells of guinea pig. In antral mucous cells, the Ca(2+)-regulated exocytosis, which is activated by acetylcholine (ACh), consists of an initial peak that declines rapidly (initial phase) followed by a second slower decline (late phase). Dinitrophenol (DNP), which depletes ATP, inhibits the ATP-dependent priming. DNP abolished the initial phase by reducing the number of primed granules, Lev decreased the frequency of initial phase, but not in the presence of DNP. Moreover, 8-bromoguanosine 3'5'-cyclic monophosphate (8BrcGMP) accelerates the ATP-dependent priming. 8BrcGMP enhances the frequency of initial phase by increasing the number of primed granule. Lev added prior to 8BrcGMP addition decreased the frequency of initial phase, but Lev added after 8BrcGMP addition did not. Thus, Lev affected the granules in the process of priming, but it did not affect the granules already primed. Lev did not affect [Ca(2+)]i in unstimulated or ACh-stimulated antral mucous cells. Immunohistochemistry and western blotting demonstrated that SV2A exists in antral mucous cells. The results suggest that SV2A plays an essential role in maintaining the process of ATP-dependent priming in antral mucous cells. In conclusion, Lev decreases the frequency of Ca(2+)-regulated exocytosis the number of primed granules by inhibiting SV2A functions, leading to a decrease in antral mucous cells.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Harada S,Tanaka S,Takahashi Y,Matsumura H,Shimamoto C,Nakano T,Kuwabara H,Sawabe Y,Nakahari Tdoi
10.1016/j.ejphar.2013.09.037subject
Has Abstractpub_date
2013-12-05 00:00:00pages
185-92issue
1-3eissn
0014-2999issn
1879-0712pii
S0014-2999(13)00690-0journal_volume
721pub_type
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